Division (f) At monitoring points which must be introduced into the stockpile, continuous measurements must be carried out to demonstrate that the mixture in the stockpile reaches a pH of at least 12 during one of the following periods of time, during which period one of the corresponding following temperatures must be achieved:F1
United Kingdom
- (i)
60 °C for 60 minutes; or
- (ii)
70 °C for 30 minutes.